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|
use crate::*;
use log::fatal;
use std::path::PathBuf;
pub struct NamedSwitchQuery<'a> {
/// The borrowed switchboard instance.
pub switchboard: &'a mut Switchboard,
/// Long switch name.
pub name: String,
/// Short switch name.
pub short: Option<char>,
/// The default value if the switch hasn't been provided.
pub default: Option<String>,
/// The default value if the switch has been provided with no value.
pub quick: Option<String>,
}
impl NamedSwitchQuery<'_> {
pub fn short(mut self, short: char) -> Self {
if !short.is_ascii_alphanumeric() {
panic!("Invalid short name for argument: {short:?}");
}
self.short = Some(short);
self
}
pub fn default(mut self, value: &str) -> Self {
self.default = Some(value.to_string());
self
}
pub fn quick(mut self, value: &str) -> Self {
self.quick = Some(value.to_string());
self
}
fn debug_name(&self) -> String {
let mut debug_name = format!("--{}", self.name);
if let Some(short) = self.short {
debug_name.push_str(&format!(" (-{})", short));
}
debug_name
}
}
pub struct PositionalSwitchQuery<'a> {
/// The borrowed switchboard instance.
pub switchboard: &'a mut Switchboard,
/// The display name of this argument.
pub name: String,
/// The default value if the switch hasn't been provided.
pub default: Option<String>,
}
impl PositionalSwitchQuery<'_> {
pub fn default(mut self, value: &str) -> Self {
self.default = Some(value.to_string());
self
}
}
macro_rules! as_number {
($type:ty, $name:expr, $error:ty) => {
paste::paste! {
fn [< as_ $type >](&mut self) -> $type {
self.[< as_ $type _opt >]().unwrap_or_else(|| self.missing("number"))
}
fn [< as_ $type _opt>](&mut self) -> Option<$type> {
self.get_value().map(|v| v.trim().parse().unwrap_or_else(
|e: $error| self.error(&v, $name, e.to_string())))
}
}
};
}
pub trait SwitchQuery {
fn get_name(&self) -> String;
fn get_value(&mut self) -> Option<String>;
fn error(&self, value: &str, ty: &str, err: String) -> ! {
let name = self.get_name();
fatal!("The {name} with value {value:?} could not be parsed as {ty}: {err}");
}
fn missing(&self, ty: &str) -> ! {
let name = self.get_name();
fatal!("The required {name} that takes a {ty} value was not provided");
}
fn as_bool(&mut self) -> bool {
if let Some(value) = self.get_value() {
match value.to_lowercase().as_str() {
"y"|"yes"|"t"|"true" => true,
"n"|"no" |"f"|"false" => false,
_ => true,
}
} else {
false
}
}
fn as_path(&mut self) -> PathBuf {
self.as_path_opt().unwrap_or_else(|| self.missing("path"))
}
fn as_path_opt(&mut self) -> Option<PathBuf> {
if let Some(value) = self.get_value() {
if !value.is_empty() {
return Some(PathBuf::from(value));
}
}
return None;
}
fn as_string(&mut self) -> String {
self.as_string_opt().unwrap_or_else(|| self.missing("string"))
}
fn as_string_opt(&mut self) -> Option<String> {
self.get_value()
}
as_number!{ f32, "f32" , std::num::ParseFloatError }
as_number!{ f64, "f64" , std::num::ParseFloatError }
as_number!{ u8, "u8" , std::num::ParseIntError }
as_number!{ u16, "u16" , std::num::ParseIntError }
as_number!{ u32, "u32" , std::num::ParseIntError }
as_number!{ u64, "u64" , std::num::ParseIntError }
as_number!{ usize, "usize", std::num::ParseIntError }
as_number!{ i8, "i8" , std::num::ParseIntError }
as_number!{ i16, "i16" , std::num::ParseIntError }
as_number!{ i32, "i32" , std::num::ParseIntError }
as_number!{ i64, "i64" , std::num::ParseIntError }
as_number!{ isize, "isize", std::num::ParseIntError }
}
impl SwitchQuery for NamedSwitchQuery<'_> {
fn get_name(&self) -> String {
format!("argument {}", self.debug_name())
}
fn get_value(&mut self) -> Option<String> {
// Find all matches first.
let mut matches = Vec::new();
for (i, switch) in self.switchboard.switches.iter().enumerate() {
match &switch.0 {
SwitchName::Short(other) => if let Some(short) = self.short {
if short == *other { matches.push(i) } }
SwitchName::Long(other) => if self.name == *other {
matches.push(i); },
};
}
match matches.len() {
0 => self.default.clone(),
1 => Some(
self.switchboard.switches.remove(matches[0]).1
.or_else(|| self.quick.clone())
.unwrap_or_else(String::new)
),
_ => fatal!("The argument {} was passed more than once", self.debug_name()),
}
}
}
impl SwitchQuery for PositionalSwitchQuery<'_> {
fn get_name(&self) -> String {
format!("positional argument {:?}", self.name)
}
fn get_value(&mut self) -> Option<String> {
self.switchboard.positional.pop().or_else(|| self.default.clone())
}
}
|
